The invention relates to the technical field of gate valve control tools, in particular to an outside-adjustable control mechanism for a gate valve. The outside-adjustable control mechanism for gate valve comprises a gate valve body and a longitudinal control rod for controlling an internal gate of the gate valve body, and an integral-structure connecting head protruding outwards is arranged at the top end of the longitudinal control rod. According to the outside-adjustable control mechanism for a gate valve, the connecting head at the top end of the longitudinal control rod is sleeved with atop assembling cover, an external control ring is fixed through internal transversely-arranged fixed rods on the outer side of the top assembling cover, overturning adjusting grooves in the external control ring are sleeved with movable connecting rings, and lateral assembling grooves internally provided with transversely-arranged assembling rods are formed in the top assembling cover. Transversely-arranged movable rods on the outer side faces of the movable connecting rings and external assembling rings with assembling notches are used for being clamped and fixed to the transversely-arrangedassembling rods, a control structure and a control mode can be freely changed as required accordingly, and the control mode of the outside-adjustable control mechanism for the gate valve is more diverse.